We are not aware of any docu- ments or standards but can offer you some cautionary advice. The majority of elevator floors are designed to carry a specific number of passengers or maxi- mum weight load. This design criterion focuses solely on how many people the car will carry rather than the stiffness or rigid- ity of the steel floor. A flexing floor is not a good environment for a tile installation. The fact that the architect is specifying a ply- wood underlayment may help, but unless the architect is willing to guarantee that this floor structure design will meet a MINIMUM of L/360, the risk for success will rest with you. Some contractors have had suc- cess in getting approval from man- ufacturers to use their epoxies to install tile in elevators. Make sure you get their warranty and recom- mendation in writing. You mentioned you had 3/4” of available depth. When completed, the elevator floor must meet ADA guidelines. This means that the finished floor must be flush with the adjacent sill or not exceed the maximum rise allowed within ADA regulations. Most times the addition of the plywood would exceed that allowance and be non-compliant. – NTCA technical trainers Mark Heinlein and Robb Roderick, with CTEF’s Scott Carothers ASK THE EXPERTS –––––––––––––––––––––––––––––––––––––––––––––––––––– CUSTOM SERVICES cutting bullnose stair treads scoring 785-437-2792 kawvalleytile.com CUSTOM TILE FABRICATION CUSTOM SERVICES excellent craftsmanship fast turnaround excellent craftsmanship fast turnaround You provide the tile, we provide the service. Call for a quote today! a division of Fox Ceramic Tile 26 TileLetter | May 2017